Document migrating from Mintlify-hosted to own repository

[yangleyland]

Added comprehensive migration documentation explaining how to migrate from a Mintlify-hosted repository to your own GitHub repository using the new connect-repo endpoint. Updated quickstart guide to link to the detailed migration instructions.

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Created by Mintlify agent

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Note

Adds a new migration guide for moving from a Mintlify‑hosted repo to your own GitHub repository and links to it from the quickstart.

• Docs (GitHub deployment):
  • Add "Migrate to your own repository" section in deploy/github.mdx with prerequisites, step-by-step instructions, and post-migration outcomes.
  • Update earlier guidance to reference the new migration section.
• Docs (Quickstart):
  • Update tip to link to deploy/github#migrate-to-your-own-repository.

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